Webc#中的等效運算符是什么? 我正在嘗試轉換以下代碼: final int pointerIndex = (action & ACTION_POINTER_INDEX_MASK) >> ACTION_POINTER_INDEX_SHIFT; WebJan 20, 2009 · An int is 32 bits, so a left shift of 33 (in Int32) is exactly the same as a left shift of 1. You don't get all zeros. A long is 64 bits, so a left-shift of 33 gives a different answer (original times 2^33). 2: Each left shift (within the data width) is the same (for integers) as x2 - so <<4 is x2x2x2x2 = x16. This is simple binary: 0000000001 = 1
Bitwise Operators in C/C++ - GeeksforGeeks
WebApr 13, 2012 · Cast c into a 32-bit number so you don't lose any bits while shifting Next, shift c by the appropriate number of bits to the left (if n==0 no shifting, if n==1 shift by 8 etc.) Create a 32-bit bitmask that will zero the lowest 8 bits of x, then shift this mask by the same amount as the last step WebApr 13, 2024 · It is a binary operator that takes two numbers, right shifts the bits of the first operand, and the second operand decides the number of places to shift. In other words, right-shifting an integer “ a ” with an integer “ b ” denoted as ‘ (a>>b) ‘ is equivalent to … fiber in sprouted bread
Bitwise operations in C - Wikipedia
WebJan 2, 2024 · Your code invokes undefined behavior on multiple counts: left shifting 1, an int value, by more than the number of bits in the type minus one invokes undefined behavior ; left shifting a signed integer by any amount such that the resulting value exceeds the range of the type invokes undefined behavior, like all other signed arithmetic overflows. WebApr 11, 2024 · Assuming this is C or C++, your error is because a Left Shifting a negative value is Undefined Behavior, and left shifting a signed value such that it becomes bigger than MAX_INT is also Undefined Behavior. If you inspect the values of a and b as you run through this sequence, you will get: -1 1 -2 2 -4 4 ... -1073741824 1073741824 WebNo, bitshift, like any other part of C, is defined in terms of values, not representations. Left-shift by 1 is mutliplication by 2, right-shift is division. (As always when using bitwise operations, beware of signedness. Everything is most well-defined for unsigned integral types.) Share Improve this answer Follow answered Aug 25, 2011 at 3:24 fiber in spinach raw 1 cup